I have the Coolingmist Vari-Cool ll, variable Progressive system in both of my Audi 2.7T ( '00 A6, '01 Allroad ). Works good using boost psi T's off of FPR. There is a member of Nefmoto that is developing a system to run w/m injection based on fuel injector duty cycle, sounds like an excellent idea.  I spoke to a tech from Coolingmist and he explained that the Variable Controller can use any 0-5v supply ( MAF, MAP, Fuel Injector, etc...) to regulate injection.   

I've attached a Coolingmist wiring/connection hookup PDF that should be suitable source info for any variable/progressive controlled W/M injections system.       I'm sure that there are some members here that are savy enough to build their own Variable Controllers.

So, if for nothing else, this PDF contains some decent W/M injection info and therefore may be helpful to some.   I do hope that I've posted to the correct area. Please excuse me if I've not.

Thank you!

Yes, by all means, am very interested...!!   IMO...w/m injection, if done right, can be the best single addition after a good tune.  The Coolingmist variable controller that I use, can access boost and a 0-5v source, although, it looks quite complicates.
 
If it's the one I'm thinking of, the Labonte is an excellent and well built controller. Basically has all the Bells & Whistles.  I'd love to see your setup when you're done.   What size nozzle/s are you going with??   The D03 puts out a really fine mist, definitely not too much and I use the dual-nozzle setup.

BTW, would this be the Labonte controller you have?      http://www.alkymethinjection.com/instructions2.html